# 构建列表 形式[] 其中元素以“，” 隔开
# 列表是有顺序的一组值，顺序是从0 位置开始
# names_str = "Mike,Mary,Jan,Jack"
squares = [1,4,9,16,25]
user_data_list = ["Mike","Mary","jan","Jack"]
password_list = [111,222,333,334]
# ...
user_data = [["Mike",111],["Mary",222]]

# 应用：请取出每一个名字(如取第一个名字)
# print(names_str[0])
print(user_data_list[0])
print(password_list[0])
print(user_data[0])

